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Inner ear: The inner ear consists of the cochlea and vestibular apparatus. The cochlea is a component of. osseous labyrinth that contains perilymph and the cochlear duct. The cochlear duct is a component of. membranous labyrinth and contains endolymph. The cochlea makes 3.25 turns in the dog (2.5 in man) around. a core of bone (called the modiolus) through which the cochlear nerve. passes. The entire complex resembles a snailâs shell (whence the term. cochlea is derived).
This structure controls the heart rate and is called the heart's natural pacemaker. The sinus node signals the heart to speed up during exercise or in situations that are stressful, frightening or exciting. For example, a 10- to 15-minute brisk walk typically elevates the heart rate to 110 to 120 beats per minute. Also, the sinus node increases the heart rate when the body is stressed because of illness. In all of these circumstances, the heart rate increase is a normal response. Likewise, the sinus node signals the heart to slow down during rest or relaxation.